<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center 
                show-icon :closable="false"></el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
                label-width="100px" label-position="top">
        <el-tabs :tab-position="'left'" v-model="activeIndex" 
                 :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item  label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item  label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item  label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item  label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader expand-trigger="hover" :options="catelist"
                            :props="cateProps" v-model="addForm.goods_cat"
                            @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                          :key="item.attr_id">
                          <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals"
                             :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到后台API地址 -->
            <el-upload :action="uploadURL" :on-preview="handlePreview"
                       :on-remove="handleRemove" list-type="picture"
                       :on-success="handleSuccess"
                       :headers="headerObj"><!-- headers属性用来设置请求头 -->
              <el-button size="small" type="primary">上传图片</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  name: 'Add',
  data() {
    return {
      //通过索引动态控制步骤条默认完成项
      activeIndex: '0',
      //添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属分类数组
        goods_cat: [],
        //图片的数组
        pics: [],
        //商品的详情描述
        goods_introduce: '',
        //用来保存信息
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      //商品分类列表
      catelist: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      //动态参数列表数据
      manyTableData: [],
      //静态属性列表数据
      onlyTableData: [],
      //上传图片的地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传组件的headers请求头对象
      headerObj: {
        //从window获取token值
        Authorization: window.sessionStorage.getItem('token')
      },
      //要预览的图片路径
      previewPath: '',
      //保存预览图片对话框的显示与隐藏
      previewVisible: false,
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    cateId() {
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  methods: {
    //获取所有商品分类数据
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if(res.meta.status !== 200){
        this.$message.error('获取商品分类数据失败!')
      }
      this.catelist = res.data
      console.log(this.catelist);
    },
    //级联选择器发生变化触发
    handleChange(){
      //console.log(this.addForm.goods_cat);
      if(this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      //console.log('已经离开的标签页名字是：' + oldActiveName);
      //console.log('当前进入的标签页名字是：' + activeName);
      //return false
      if(oldActiveName == '0' && this.addForm.goods_cat.length !== 3){
        this.$message.error('请先选择商品分类!')
        return false
      }
    },
    async tabClicked() {
      //如果activeIndex为1，证明访问的是动态参数面板
      if(this.activeIndex === '1'){
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {
          sel: 'many' //这里我们只需要获取参数
        }})
        if(res.meta.status !== 200){
          return this.$message.error('获取动态参数列表失败')
        }
        //console.log(res.data);
        //将数据用forEach遍历再用split分割成数组
        res.data.forEach(item => {
          //判断里面是否为空字符串
          item.attr_vals = item.attr_vals.length === 0 ? 
          [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }else if(this.activeIndex === '2'){
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {
          sel: 'only' //这里我们只需要获取属性
        }})
        if(res.meta.status !== 200){
          return this.$message.error('获取静态属性列表失败')
        }
        console.log(res.data);
        this.onlyTableData = res.data
      }
    },
    //处理图片预览效果
    handlePreview(file) {
      //获取图片路径
      this.previewPath = file.response.data.url
      //显示预览图片对话框
      this.previewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file) {
      //console.log(file);
      //1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tem_path
      //2.从pics数组中找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      //3.调用数组的splice方法，把图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1)
      //console.log(this.addForm); 
    },
    //监听图片上传成功事件
    handleSuccess(response) {
      //console.log(response);
      //1.拼接得到一个图片信息对象
      const picInfo = {pic: response.data.tmp_path}
      //2.将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
      //console.log(this.addForm);
    },
    //富文本编辑器下面的添加商品按钮
    add() {
      //预验证
      this.$refs.addFormRef.validate(async valid => {
        if(!valid){
          return this.$message.error('请填写必要的表单项!')
        }
        //执行添加的业务逻辑
        //用lodash的cloneDeep(obj)---深拷贝 将addForm深拷贝给form
        const form = _.cloneDeep(this.addForm)
        //将goods_cat数组转化成字符串
        form.goods_cat = form.goods_cat.join(',')

        //处理动态参数
        this.manyTableData.forEach(item => {
          //将我们只需要的数据赋值给newInfo
          const newInfo = {
            attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')
          }
          //再将newInfo里面的数据push给addForm里面的attrs保存起来
          this.addForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach(item => {
          //将我们只需要的数据赋值给newInfo
          const newInfo = {
            //静态属性本来就是字符串，所以不用转化
            attr_id: item.attr_id, attr_value: item.attr_vals
          }
          //再将newInfo里面的数据push给addForm里面的attrs保存起来
          this.addForm.attrs.push(newInfo)
        })
        //将addForm的attrs赋值给form的attrs
        form.attrs = this.addForm.attrs
        console.log(form);

        //发起请求，添加商品
        //商品的名称必须是唯一的
        const {data: res} = await this.$http.post('goods', form)
        if(res.meta.status !== 201){
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功!')
        //通过编程式导航跳转到商品列表页面
        this.$router.push('/goods')
      })
    }
  }
}
</script>

<style lang="less" scoped>
 .el-checkbox {
   margin: 0 10px 0 0 !important;
 }
 .previewImg {
   width: 100%;
 }
 .btnAdd {
   margin-top: 15px;
 }
</style>